In order to get full credit please answer completely and show all necessary work

Question

In order to get full credit please answer completely and show all necessary work. Record your answers on the answer sheet. The magnitude of the charge on an electron is approximately: 10^23 C 10^-23 C 10^19 C 10^-19 C 10^9 C The diagram shows two pairs of heavily charged plastic cubes. Cubes 1 and 2 attract each other and cubes 1 and 3 repel each other. Which of the following illustrates the forces of cube 2 on cube 3 and cube 3 on cube 2? Two identical charges, 2.0m apart, exert forces of magnitude 4.0N on each other. The value of either charge is: 1.8 Times 10^-9 C 2.1 Times 10^-5 C 4.2 Times 10^-5 C 1.9 Times 10^5 C 3.8 Times 10^5 C

Explanation / Answer

1.

Answer is D)10-19C

The Charge of an electron is

Q=-1.6*10-19C

2.

Answer is C)

Let Cube 1 be having "+"ve charge ,so cube 2 must be "-" ve for them to attract each other.

Cube 3 must be "+"ve charge for the two charges 1 and 3 to repel each other.

So Cube 2 and Cube 3 will attract each other ,since they have opposite charges .

3.

From Coloumb's law

F=KQ2/r2

4=(9*109)*Q2/22

Q=sqrt[4*4/(9*109)]

Q=4.2*10-5 C

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